If the warranty period has not expired (within 5 years from the date of completion of the house), you can use the maintenance fund, but you may need one-third of the owners to sign the building, and you can consult the property for details. If it doesn't pass, it is recommended to ask for maintenance as soon as possible. If the warranty period expires, it is recommended to find a professional waterproof company to do waterproof treatment and sign a maintenance contract.